User manual HANNA INSTRUMENTS WM 8910

[. . . ] Instruction Manual WM 8910 - WM 8911 WM 8912 - WM 8913 WM 8920 - WM 8923 WM 8930 Wall Mounted ORP - pH - Conductivity Controllers http://www. hannainst. com These Instruments are in Compliance with the CE Directives Dear Customer, Thank you for choosing a Hanna Product. Please read this instruction manual carefully before using the instrument. This manual will provide you with the necessary information for a correct use of the instrument, as well as a more precise idea of its versatility. If you need more technical information, do not hesitate to e-mail us at tech@hannainst. com. [. . . ] Immerse the electrode and/or probe in the test solution and set the switch to "MEASURE" (for WM 8910, WM 8911, WM 8920 and WM 8930 only). OR The actual pH, ORP or conductivity value of the test solution will be displayed. 24 25 When the meter is in pH dosage mode and the terminals are activated, the DOSE LED will be lit (for WM 8912, WM 8913 and WM 8923 only). pH CALIBRATION (for WM 8910, WM 8911, WM 8912, WM 8913, WM 8923 only) Make sure a combination pH electrode is connected to the BNC socket and the meter is plugged to the mains. The calibration should be ideally performed at the temperature of the liquid that is being controlled. Use a ChecktempC (or an accurate thermometer) as reference for a temperature compensated calibration. Likewise for the DOSE LED of the ORP controller WM 8912. OFFSET ADJUSTMENT: Similarly, DOSE LED of WM 8913 and WM 8923 will be lit when conductivity terminals are activated. Note: When both the LEDs are lit up simultaneously, the pH dosage is given priority over ORP/conductivity dosage. °C · Remove the protective cap from the electrode, rinse it with some pH 7. 01 solution (HI 7007), then dip it in pH 7. 01 buffer. Note: The electrode should be submerged approximately 4 cm (1½") into the solution. For WM 8910 and WM 8911 only: · Short the MTC and the middle terminals and adjust the "°C" knob to the temperature of the solution (e. g. 25°C). 4 cm (1½") HI 7007 · Stir the electrode and wait about one minute before adjusting the "OFFSET" or the "pH7" trimmer to display pH 7. 01 on the LCD if the temperature of the buffer solution is at 25°C (77°F). · If the temperature of the buffer solution is not 25°C (77°F), refer to the chart on page 37 for the appropriate buffer value at a given temperature. 26 27 SLOPE ADJUSTMENT: °C · Rinse the electrode thoroughly in water and immerse it in pH 4. 01 (HI 7004) or pH 10. 01 (HI 7010) buffer solution. Note: Use pH 4. 01 if you are going to measure acidic samples or pH 10. 01 for alkaline measurements. · Stir the electrode and wait about one minute before adjusting the "SLOPE" or "pH 4" trimmer to display pH 4. 01 (or 10. 01) on the LCD if the temperature of the buffer solution is at 25°C (77°F). Otherwise, refer to the chart on page 37 for appropriate buffer value corresponding to the buffer temperature temperature. The pH calibration is now complete. 4 cm (1½") HI 7004 For WM 8912 only: ORP calibration is not required, however, you can check the correct functioning of the ORP electrode by immersing it into a HI 7020 solution. If necessary follow cleaning and maintenance procedures described on page 40. CONDUCTIVITY CALIBRATION (for WM 8913, WM 8923 and WM 8930 only) Make sure the HI 7637 conductivity probe is connected to the DIN socket and the meter is plugged to the mains. The calibration should be ideally performed at the temperature of the liquid that is being controlled. PROCEDURE: · Ensure that the probe is connected to the meter securely by aligning the pins with the socket, pushing the plug in and tightening the threaded ring. · Insert and screw the probe into the PVC sleeve with the holes towards the top (the end nearest to the cable). ORP CALIBRATION (WM 8920 only) Make sure a combination ORP electrode is connected to the BNC socket and the meter is plugged to the mains. · Turn the switch to the "MEASURE" position. · Turn the switch to the "MEASURE" position. · With the conductivity probe in air, adjust the "OFFSET" or "0mS" trimmer. · Immerse the electrode in HI 7020 ORP solution. HI 7020 4 cm (1½") · Adjust the slope trimmer until an ORP value of between 200 mV and 250 mV is displayed. You can however readjust the offset by shorting the ORP input connector on the controller and turning the offset trimmer if necessary to read 0 mV. 28 29 · Immerse the probe into a beaker with a known calibration solution preferably close to the value of the sample stream (HI 7039L at 5000 µS/cm is recommended for slope calibration). The level of solution must be higher than the holes on the PVC sleeve. · Tap the probe repeatedly on the bottom of the beaker and stir it to ensure that no air bubbles are trapped inside the sleeve. · When the reading stabilizes, turn the "SLOPE" or the "5. 0 mS" trimmer until the LCD reading is the same of the calibration solution at the liquid temperature. · If the instrument will not calibrate refer to the Probe Maintenance and Cleaning section (see page 45). ADJUSTEMENT OF SETPOINT(S) Make sure that the controller with the electrode or probe installed is calibrated before operating (see pages 27-30). FOR WM 8910 Turn the switch to the "SET" position. [. . . ] Additional lengths of regular cable up to 50 m (165'), can be installed without special connectors. Coaxial cables are always preferred over normal cables due to their excellent insulation, even though, Amphel® electrodes can operate with both. AmpHel® electrodes have a micro-amplifier in the electrode cap to boost the signal, drastically reducing susceptibility to noise and drift. With all of the components sealed in the electrode body, moisture up to 100% RH will not effect the signal. MAXIMUM 50 METERS CONDUCTIVITY PROBE MAINTENANCE & CLEANING The probe can be compensated for normal contamination by a process of re-calibration. [. . . ]